摘要: 1) select b.name from A a left join B b on a.id=b.id 可以写成 连接 select ( select distinct name from B b where b.id = a.id ) as name from A a; 2)in 比betwee 阅读全文
posted @ 2024-12-13 17:05 无功 阅读(12) 评论(0) 推荐(0) 编辑